chrome/browser/media_galleries/fileapi/safe_audio_video_checker.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/media_galleries/fileapi/safe_audio_video_checker.h"
   6
   7 #include "base/bind.h"
   8 #include "base/callback.h"
   9 #include "base/location.h"
  10 #include "base/logging.h"
  11 #include "base/process/process_handle.h"
  12 #include "chrome/common/chrome_utility_messages.h"
  13 #include "content/public/browser/child_process_data.h"
  14 #include "content/public/browser/utility_process_host.h"
  15 #include "content/public/browser/browser_thread.h"
  16 #include "ipc/ipc_message_macros.h"
  17 #include "ipc/ipc_platform_file.h"
  18
  19 SafeAudioVideoChecker::SafeAudioVideoChecker(
  20     const base::PlatformFile& file,
  21     const fileapi::CopyOrMoveFileValidator::ResultCallback& callback)
  22     : state_(INITIAL_STATE),
  23       file_(file),
  24       file_closer_(&file_),
  25       callback_(callback) {
  26   DCHECK(!callback.is_null());
  27 }
  28
  29 void SafeAudioVideoChecker::Start() {
  30   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
  31   if (state_ != INITIAL_STATE)
  32     return;
  33   state_ = PINGED_STATE;
  34
  35   DCHECK(file_closer_);
  36   if (*file_closer_.get() == base::kInvalidPlatformFileValue) {
  37     callback_.Run(base::PLATFORM_FILE_ERROR_SECURITY);
  38     state_ = FINISHED_STATE;
  39     return;
  40   }
  41
  42   utility_process_host_ = content::UtilityProcessHost::Create(
  43       this, base::MessageLoopProxy::current())->AsWeakPtr();
  44   utility_process_host_->Send(new ChromeUtilityMsg_StartupPing);
  45 }
  46
  47 SafeAudioVideoChecker::~SafeAudioVideoChecker() {}
  48
  49 void SafeAudioVideoChecker::OnProcessStarted() {
  50   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
  51   if (state_ != PINGED_STATE)
  52     return;
  53   state_ = STARTED_STATE;
  54
  55   if (utility_process_host_->GetData().handle == base::kNullProcessHandle)
  56     DLOG(ERROR) << "Child process handle is null";
  57   IPC::PlatformFileForTransit file_for_transit =
  58       IPC::GetFileHandleForProcess(*file_closer_.release(),
  59                                    utility_process_host_->GetData().handle,
  60                                    true /* close_source_handle */);
  61   const int64 kFileDecodeTimeInMS = 250;
  62   utility_process_host_->Send(new ChromeUtilityMsg_CheckMediaFile(
  63       kFileDecodeTimeInMS, file_for_transit));
  64 }
  65
  66 void SafeAudioVideoChecker::OnCheckingFinished(bool valid) {
  67   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
  68   if (state_ != STARTED_STATE)
  69     return;
  70   state_ = FINISHED_STATE;
  71
  72   callback_.Run(valid ? base::PLATFORM_FILE_OK
  73                       : base::PLATFORM_FILE_ERROR_SECURITY);
  74 }
  75
  76 void SafeAudioVideoChecker::OnProcessCrashed(int exit_code) {
  77   OnCheckingFinished(false);
  78 }
  79
  80 bool SafeAudioVideoChecker::OnMessageReceived(const IPC::Message& message) {
  81   bool handled = true;
  82   IPC_BEGIN_MESSAGE_MAP(SafeAudioVideoChecker, message)
  83     IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_ProcessStarted,
  84         OnProcessStarted)
  85     IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_CheckMediaFile_Finished,
  86         OnCheckingFinished)
  87     IPC_MESSAGE_UNHANDLED(handled = false)
  88   IPC_END_MESSAGE_MAP()
  89   return handled;
  90 }